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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: HelpCommand.html 409 2014-08-18 16:46:48Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.cli.cmd;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.io.PrintWriter;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.HashSet;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Map;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.cli.CliSession;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.jsimpledb.parse.ParseContext;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.parse.Parser;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.jsimpledb.parse.WordParser;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.jsimpledb.parse.func.AbstractFunction;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>@Command<a name="line.20"></a>
<span class="sourceLineNo">021</span>public class HelpCommand extends AbstractCommand {<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>    private final CliSession session;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    public HelpCommand(CliSession session) {<a name="line.25"></a>
<span class="sourceLineNo">026</span>        super("help command-or-function:cmdfunc?");<a name="line.26"></a>
<span class="sourceLineNo">027</span>        this.session = session;<a name="line.27"></a>
<span class="sourceLineNo">028</span>    }<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    @Override<a name="line.30"></a>
<span class="sourceLineNo">031</span>    public String getHelpSummary() {<a name="line.31"></a>
<span class="sourceLineNo">032</span>        return "display help information";<a name="line.32"></a>
<span class="sourceLineNo">033</span>    }<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>    @Override<a name="line.35"></a>
<span class="sourceLineNo">036</span>    public String getHelpDetail() {<a name="line.36"></a>
<span class="sourceLineNo">037</span>        return "Displays the list of known commands and functions, or help information about a specific command or function.";<a name="line.37"></a>
<span class="sourceLineNo">038</span>    }<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>    @Override<a name="line.40"></a>
<span class="sourceLineNo">041</span>    protected Parser&lt;?&gt; getParser(String typeName) {<a name="line.41"></a>
<span class="sourceLineNo">042</span>        if ("cmdfunc".equals(typeName)) {<a name="line.42"></a>
<span class="sourceLineNo">043</span>            return new WordParser("command/function") {<a name="line.43"></a>
<span class="sourceLineNo">044</span>                @Override<a name="line.44"></a>
<span class="sourceLineNo">045</span>                protected HashSet&lt;String&gt; getWords() {<a name="line.45"></a>
<span class="sourceLineNo">046</span>                    final HashSet&lt;String&gt; names = new HashSet&lt;&gt;();<a name="line.46"></a>
<span class="sourceLineNo">047</span>                    names.addAll(HelpCommand.this.session.getCommands().keySet());<a name="line.47"></a>
<span class="sourceLineNo">048</span>                    names.addAll(HelpCommand.this.session.getFunctions().keySet());<a name="line.48"></a>
<span class="sourceLineNo">049</span>                    return names;<a name="line.49"></a>
<span class="sourceLineNo">050</span>                }<a name="line.50"></a>
<span class="sourceLineNo">051</span>            };<a name="line.51"></a>
<span class="sourceLineNo">052</span>        }<a name="line.52"></a>
<span class="sourceLineNo">053</span>        return super.getParser(typeName);<a name="line.53"></a>
<span class="sourceLineNo">054</span>    }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    @Override<a name="line.56"></a>
<span class="sourceLineNo">057</span>    public CliSession.Action getAction(CliSession session, ParseContext ctx, boolean complete, Map&lt;String, Object&gt; params) {<a name="line.57"></a>
<span class="sourceLineNo">058</span>        final String name = (String)params.get("command-or-function");<a name="line.58"></a>
<span class="sourceLineNo">059</span>        return new CliSession.Action() {<a name="line.59"></a>
<span class="sourceLineNo">060</span>            @Override<a name="line.60"></a>
<span class="sourceLineNo">061</span>            public void run(CliSession session) throws Exception {<a name="line.61"></a>
<span class="sourceLineNo">062</span>                final PrintWriter writer = session.getWriter();<a name="line.62"></a>
<span class="sourceLineNo">063</span>                if (name == null) {<a name="line.63"></a>
<span class="sourceLineNo">064</span>                    writer.println("Available commands:");<a name="line.64"></a>
<span class="sourceLineNo">065</span>                    for (AbstractCommand availableCommand : session.getCommands().values())<a name="line.65"></a>
<span class="sourceLineNo">066</span>                        writer.println(String.format("%24s - %s", availableCommand.getName(), availableCommand.getHelpSummary()));<a name="line.66"></a>
<span class="sourceLineNo">067</span>                    writer.println("Available functions:");<a name="line.67"></a>
<span class="sourceLineNo">068</span>                    for (AbstractFunction availableFunction : session.getFunctions().values())<a name="line.68"></a>
<span class="sourceLineNo">069</span>                        writer.println(String.format("%24s - %s", availableFunction.getName(), availableFunction.getHelpSummary()));<a name="line.69"></a>
<span class="sourceLineNo">070</span>                } else {<a name="line.70"></a>
<span class="sourceLineNo">071</span>                    final AbstractCommand command = session.getCommands().get(name);<a name="line.71"></a>
<span class="sourceLineNo">072</span>                    if (command != null) {<a name="line.72"></a>
<span class="sourceLineNo">073</span>                        writer.println("Usage: " + command.getUsage());<a name="line.73"></a>
<span class="sourceLineNo">074</span>                        writer.println(command.getHelpDetail());<a name="line.74"></a>
<span class="sourceLineNo">075</span>                    }<a name="line.75"></a>
<span class="sourceLineNo">076</span>                    final AbstractFunction function = session.getFunctions().get(name);<a name="line.76"></a>
<span class="sourceLineNo">077</span>                    if (function != null) {<a name="line.77"></a>
<span class="sourceLineNo">078</span>                        writer.println("Usage: " + function.getUsage());<a name="line.78"></a>
<span class="sourceLineNo">079</span>                        writer.println(function.getHelpDetail());<a name="line.79"></a>
<span class="sourceLineNo">080</span>                    }<a name="line.80"></a>
<span class="sourceLineNo">081</span>                    if (command == null &amp;&amp; function == null)<a name="line.81"></a>
<span class="sourceLineNo">082</span>                        writer.println("No command or function named `" + name + "' exists.");<a name="line.82"></a>
<span class="sourceLineNo">083</span>                }<a name="line.83"></a>
<span class="sourceLineNo">084</span>            }<a name="line.84"></a>
<span class="sourceLineNo">085</span>        };<a name="line.85"></a>
<span class="sourceLineNo">086</span>    }<a name="line.86"></a>
<span class="sourceLineNo">087</span>}<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>




























































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